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If it is free standing water , meaning water not bottled up in a air tite jar then yes put some H202 in the water every so often , If what your doing is heating water in a open container with jars sitting in it or above it always use some h202,, foaf added h202 once once a week to his incubator . Open water is a breading ground for contams .

--------------------This statment or question is fictional and for fun not to be used in real life. Just a hypothetical situation..